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Vishay General Semiconductor - Diodes Division 1.5KE440A-E3/54
- Part No.:
- 1.5KE440A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE440A-E3/54.pdf
- Description:
- TVS DIODE 376VWM 602VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:3,207
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Product details
Overview
1.5KE440A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 440 V standoff voltage (VWM), 418–462 V breakdown voltage (VBR) at 1 mA, 602 V clamping voltage (VC) at 2.5 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom infrastructure.
For engineers reviewing the 1.5KE440A-E3/54 datasheet, 1.5KE440A-E3/54 pinout, 1.5KE440A-E3/54 application, or 1.5KE440A-E3/54 equivalent, this part delivers verified clamping performance for 400–450 V DC bus protection, meets JEDEC 1.5KE package mechanical standards, supports RoHS-compliant reflow and wave soldering, and requires no polarity marking beyond cathode band for unidirectional operation.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under transient overvoltage, it avalanches rapidly (<1 ns response) to divert surge current away from downstream components. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, critical for repeatable clamping across 1500 W pulses.
The device is rated for -55 °C to +175 °C operating junction temperature, with thermal resistance of 15.4 °C/W (junction-to-lead), enabling direct PCB-mount heat dissipation without heatsinks in moderate-duty-cycle applications. It complies with UL 497B recognition (QVGQ2) and JESD 22-B106 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 376 V - maximum continuous reverse voltage before leakage exceeds 1 µA; sets upper limit for normal DC rail operation |
| VBR (Breakdown Voltage) | 418–462 V at 1 mA - precise avalanche onset range ensuring predictable turn-on during transients |
| VC (Clamping Voltage) | 602 V at IPPM = 2.5 A - peak voltage seen by protected circuit during full-rated 10/1000 µs surge |
| PPPM (Peak Pulse Power) | 1500 W - energy-handling capacity for 1 ms surges per JEDEC standard, sufficient for IEC 61000-4-5 Level 4 |
| IFSM (Surge Current) | 200 A - 8.3 ms half-sine forward surge rating, supporting unidirectional rectifier-stage protection |
| TJ max. | +175 °C - enables reliable operation in high-ambient environments like enclosed power converters |
| RθJL | 15.4 °C/W - low junction-to-lead thermal resistance allows effective conduction cooling through PCB copper |
Pinout & Package
Package: JEDEC DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body with matte tin-plated leads. Cathode identified by color band; bidirectional variants omit marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return in unidirectional configuration; must be routed with low-inductance trace |
| Cathode | Avalanche clamping node / high-side connection | Connected to protected line (e.g., 400 V DC bus); color band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures ±5% VBR tolerance and long-term stability under thermal cycling and humidity stress |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 combination wave testing up to 4 kV open-circuit / 2 kA short-circuit |
| Clamping ratio VC/VBR ≈ 1.37 | Low overvoltage margin preserves safe operating area of protected 450 V-rated MOSFETs and capacitors |
| Response time <1 ns | Outperforms MOVs and GDTs in speed, preventing sub-microsecond voltage overshoot on sensitive inputs |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance and J-STD-002 solderability for lead-free assembly |
Applications
| Industrial DC Power Supply Protection | Telecom Line Card Surge Protection |
|---|---|
Use Scenario: 400 V DC intermediate bus in programmable logic controller (PLC) power modules exposed to inductive switching noise and load dump events. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between +400 V rail and chassis ground to clamp transients before they reach DC-DC controllers and gate drivers. Use Value: Limits voltage excursions to ≤602 V during 1500 W surges, preserving 650 V MOSFET SOA and avoiding capacitor derating penalties. |
Use Scenario: Primary-side protection on AC/DC front-end of 48 V telecom shelf power supply subjected to lightning-induced surges on utility input. IC Role / Device Role / Timing Role: Standoff-rated TVS on rectified DC link to absorb differential-mode surges before isolation transformer and PFC stage. Use Value: Clamps 10/1000 µs transients within 1 ns, preventing false triggering of overvoltage protection and maintaining system uptime. |
| Automotive On-Board Charger (OBC) Input Stage | Renewable Energy Inverter DC Link |
Use Scenario: High-voltage DC input (350–450 V) of bidirectional OBC in EV charging systems, subject to grid transients and regenerative braking spikes. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly at HV connector entry point to suppress fast-rising common-mode surges coupled into DC bus. Use Value: Withstands 200 A 8.3 ms forward surge, enabling robust protection during battery disconnect events without degradation. |
Use Scenario: DC link between PV string combiner and three-phase inverter in commercial solar farms, where lightning-induced surges exceed 6 kV. IC Role / Device Role / Timing Role: Primary clamping device on positive DC rail, coordinated with secondary MOVs to share energy and extend lifetime. Use Value: 175 °C max junction temperature supports operation in outdoor enclosures with minimal derating, reducing thermal management overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ440A | Same VWM (376 V), identical DO-214AC package, but lower PPPM (400 W) and higher VC (648 V at 2.5 A) | Not suitable for 1500 W surge requirements; limited to lower-energy IEC 61000-4-5 Level 2 | Select only when board space constraints require surface-mount and surge energy is ≤400 W |
| ON Semiconductor 1N5388B | Higher VWM (380 V), same DO-201AD package, but lower PPPM (500 W) and wider VBR tolerance (±10%) | Lacks UL 497B recognition and AEC-Q101 qualification path; not recommended for safety-critical telecom or automotive use | Acceptable for cost-sensitive industrial controls where certification is not mandated |
Compared with 1.5KE440A-E3/54, SMAJ440A offers SMT compatibility but sacrifices 73% peak power handling, while 1N5388B trades certification and precision for marginal cost reduction - neither matches the 1500 W capability, tight VBR, or regulatory coverage of the 1.5KE440A-E3/54.
Availability
1.5KE440A-E3/54 is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure equipment, and renewable energy inverters requiring stable component supply, long-lifecycle support, and certified surge protection performance.
Supply support for 1.5KE440A-E3/54 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and passive components for demanding industrial, automotive, and computing applications.
The 1.5KE series was engineered specifically for high-energy transient suppression in 400–500 V DC systems, emphasizing stable clamping, JEDEC-standard packaging, and compliance with UL, AEC-Q101, and RoHS requirements.
FAQ
What is the clamping voltage of the 1.5KE440A-E3/54 under full-rated surge conditions?
The 1.5KE440A-E3/54 exhibits a maximum clamping voltage (VC) of 602 V when subjected to its rated peak pulse current of 2.5 A with a 10/1000 µs waveform. This value is measured per JEDEC standard and defines the highest voltage imposed on the protected circuit during worst-case transient events. The 1.5KE440A-E3/54 maintains this clamping performance across its full operating temperature range (-55 °C to +175 °C), with minimal drift due to its glass-passivated junction structure.
Is the 1.5KE440A-E3/54 suitable for automotive applications?
The 1.5KE440A-E3/54 is a commercial-grade device and is not AEC-Q101 qualified. While it shares the same 1.5KE package and electrical characteristics as AEC-Q101 variants (e.g., 1.5KE440AHE3_B), the E3/54 suffix denotes RoHS-compliant commercial grade only. For automotive use, engineers must select the HE3-suffixed variant explicitly qualified to AEC-Q101. The 1.5KE440A-E3/54 remains appropriate for industrial and telecom applications where AEC-Q101 is not mandated.
How does the 1.5KE440A-E3/54 compare to MOV-based protection at 400 V DC?
Unlike metal-oxide varistors (MOVs), the 1.5KE440A-E3/54 provides precise, repeatable clamping with <1 ns response time, no wear-out mechanism, and stable leakage (<1 µA at 376 V). MOVs exhibit higher capacitance, slower response (~20–50 ns), and parametric drift after repeated surges. The 1.5KE440A-E3/54's 602 V clamping voltage also offers tighter control than typical MOVs at this voltage class, making it preferable for protecting sensitive 650 V silicon carbide devices in high-frequency power converters.
What is the thermal resistance and how does it affect PCB layout for the 1.5KE440A-E3/54?
The 1.5KE440A-E3/54 has a typical junction-to-lead thermal resistance (RθJL) of 15.4 °C/W, meaning each watt of sustained power dissipation raises the junction temperature by ~15.4 °C above lead temperature. To manage heat during repetitive surges, PCB traces connected to both anode and cathode should use ≥2 oz copper and ≥5 mm width, with thermal vias to inner ground planes. The 1.5KE440A-E3/54's RθJA of 75 °C/W indicates ambient cooling alone is insufficient for >1 W average dissipation - lead conduction is the primary thermal path.
Can the 1.5KE440A-E3/54 be used in bidirectional configurations?
No - the 1.5KE440A-E3/54 is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., 1.5KE220CA), which is only available up to 220 V VBR. For 440 V-level bidirectional protection, engineers must use series-connected unidirectional devices or select alternative families such as SMAJ or SMCJ with CA suffixes rated for higher voltages. Using the 1.5KE440A-E3/54 in reverse bias beyond its 376 V VWM risks permanent breakdown.
1.5KE440A-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 376V
- Voltage - Breakdown (Min):
- 418V
- Voltage - Clamping (Max) @ Ipp:
- 602V
- Current - Peak Pulse (10/1000µs):
- 2.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE440A-E3/54 FAQ
1.How can I place an order for 1.5KE440A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE440A-E3/54 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1.5KE440A-E3/54 reliable?
The price and inventory of 1.5KE440A-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE440A-E3/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE440A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE440A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE440A-E3/54?
1.5KE440A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE440A-E3/54 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1.5KE440A-E3/54?
For technical support, including 1.5KE440A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE440A-E3/54 requirements.
6.How does Aetrix verify that 1.5KE440A-E3/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE440A-E3/54 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1.5KE440A-E3/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE440A-E3/54?
All 1.5KE440A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE440A-E3/54, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1.5KE440A-E3/54 part is unused and in its original packaging.
Return procedure for 1.5KE440A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE440A-E3/54 Tags
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